<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>事件对象</title>
    <style>
        div {
            width: 200px;
            height: 200px;
            background-color: pink;
        }
    </style>
</head>
<body>
    <div>123</div>
    <script>
        var div = document.querySelector('div');
        div.onclick = function(e) {
            // 1.
            console.log(e);
            // 2.
            e = e || window.event;
            console.log(e);
            // ie678使用的方法
            console.log(window.e);

        }
            // 3.
        div.addEventListener('click',function(e) {
            console.log(e);
        })
    </script>
</body>
</html>